/// <summary> /// 获取 Time 类型的 SQL 片断 /// </summary> /// <param name="value">值</param> /// <param name="dbType">数据类型</param> /// <param name="scale">小数位</param> /// <returns></returns> protected override string GetSqlValueByTime(object value, object dbType, int?scale) { // the range is '-838:59:59.000000' to '838:59:59.000000' new TimeSpan(-34, -22, -59, -59)~new TimeSpan(34, 22, 59, 59); // https://dev.mysql.com/doc/refman/8.0/en/time.html TimeSpan ts = (TimeSpan)value; int hours = (int)ts.TotalHours; // 默认精度为7 string format = @"mm\:ss\.ffffff"; if (DbTypeUtils.IsTime(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 6 ? 6 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format(@"mm\:ss\.{0}", s); } } string result = ts.ToString(format); result = string.Format("{0}:{1}", hours, result); result = this.EscapeQuote(result, false, false); return(result); }
// 获取 Time 类型的 SQL 片断 protected override string GetSqlValueByTime(object value, object dbType, int?scale) { // https://docs.oracle.com/en/database/oracle/oracle-database/12.2/nlspg/datetime-data-types-and-time-zone-support.html#GUID-FD8C41B7-8CDC-4D02-8E6B-5250416BC17D TimeSpan ts = (TimeSpan)value; // 默认精度为6 string format = @"hh\:mm\:ss\.ffffff"; if (DbTypeUtils.IsTime(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 7 ? 7 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format(@"hh\:mm\:ss\.{0}", s); } } string result = ts.ToString(format); result = string.Format("{0} {1}", ts.Days, result); result = this.EscapeQuote(result, false, false); result = string.Format("TO_DSINTERVAL({0})", result); return(result); }
/// <summary> /// 获取 Time 类型的 SQL 片断 /// </summary> /// <param name="value">值</param> /// <param name="dbType">数据类型</param> /// <param name="scale">小数位</param> /// <returns></returns> protected override string GetSqlValueByTime(object value, object dbType, int?scale) { // SQLSERVER 的Time类型范围:00:00:00.0000000 到 23:59:59.9999999 // https://docs.microsoft.com/zh-cn/sql/t-sql/data-types/time-transact-sql?view=sql-server-2017 // 默认精度为7 string format = @"hh\:mm\:ss\.fffffff"; if (DbTypeUtils.IsTime(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 7 ? 7 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format(@"hh\:mm\:ss\.{0}", s); } } string result = this.EscapeQuote(((TimeSpan)value).ToString(format), false, false); return(result); }
// 获取 Time 类型的 SQL 片断 protected override string GetSqlValueByTime(object value, object dbType, int?precision) { // 默认精度为7 string format = @"hh\:mm\:ss\.fffffff"; if (DbTypeUtils.IsTime(dbType)) { string pad = string.Empty; if (precision != null && precision.Value > 0) { pad = "f".PadLeft(precision.Value > 7 ? 7 : precision.Value, 'f'); } if (!string.IsNullOrEmpty(pad)) { format = string.Format(@"hh\:mm\:ss\.{0}", pad); } } string result = this.EscapeQuote(((TimeSpan)value).ToString(format), false, false); return(result); }
// 获取 Time 类型的 SQL 片断 protected override string GetSqlValueByTime(object value, object dbType, int?scale) { // 默认精度6 string format = @"hh\:mm\:ss\.ffffff"; if (DbTypeUtils.IsTime(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 6 ? 6 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format(@"hh\:mm\:ss\.{0}", s); } } string date = ((TimeSpan)value).ToString(format); string result = string.Format("'{0}'::TIME", date); return(result); }
/// <summary> /// 访问 ToString 方法 /// </summary> /// <param name="node">即将访问的表达式</param> protected override Expression VisitToStringImpl(Expression node) { // => a.ID.ToString() // 字符串不进行转换 if (node == null || node.Type == typeof(string)) { return(_visitor.Visit(node)); } // 其它类型转字符串 bool isDate = node.Type == typeof(TimeSpan) || node.Type == typeof(TimeSpan?) || node.Type == typeof(DateTime) || node.Type == typeof(DateTime?) || node.Type == typeof(DateTimeOffset) || node.Type == typeof(DateTimeOffset?); if (isDate) { _builder.Append("TO_CHAR("); _visitor.Visit(node); string format = string.Empty; ColumnAttribute c = _visitedMark.Current != null?TypeUtils.GetColumnAttribute(_visitedMark.Current.Member, _visitedMark.Current.ReflectedType) : null; if (c != null && DbTypeUtils.IsTime(c.DbType)) { format = "hh24:mi:ss.us"; } else if (c != null && DbTypeUtils.IsDate(c.DbType)) { format = "yyyy-mm-dd"; } else if (c != null && (DbTypeUtils.IsDateTime(c.DbType) || DbTypeUtils.IsDateTime2(c.DbType))) { format = "yyyy-mm-dd hh24:mi:ss.us"; } else if (c != null && DbTypeUtils.IsDateTimeOffset(c.DbType)) { format = "yyyy-mm-dd hh24:mi:ss.us TZH:TZM"; } // 没有显式指定数据类型,则根据表达式的类型来判断 if (string.IsNullOrEmpty(format)) { if (node.Type == typeof(TimeSpan) || node.Type == typeof(TimeSpan?)) { format = "hh24:mi:ss.us"; } else if (node.Type == typeof(DateTime) || node.Type == typeof(DateTime?)) { format = "yyyy-mm-dd hh24:mi:ss.us"; } else if (node.Type == typeof(DateTimeOffset) || node.Type == typeof(DateTimeOffset?)) { format = "yyyy-mm-dd hh24:mi:ss.us TZH:TZM"; } } if (!string.IsNullOrEmpty(format)) { _builder.Append(",'"); _builder.Append(format); _builder.Append("'"); } _builder.Append(')'); } else if (node.Type == typeof(byte[])) { _builder.Append("ENCODE("); _visitor.Visit(node); _builder.Append(",'hex')"); } else { _builder.Append("CAST("); _visitor.Visit(node); _builder.Append(" AS VARCHAR)"); } return(node); }